Rtools missing?


When I want to instal a package I get the following warning: WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding.
However, I did download Rtools and when I do it again with the tips of Rstudio it is indeed said that I already have Rtools. Also, a week or so ago it worked perfectly fine! What am I doing wrong?

Thanks a lot for the help! Beste regards

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